Lead pan



g- 1932. F. A. FAHRENWALD LEAD PAN Fild'April 25. 1951 I am y Jim/era??? PatentedAug. 23, 1932 v UNITED f PATENr-FoFFrcE FRANKA. FAHRENWALD, ononrcaco, uniors mn PAN T Application filed April 25 This invention relates to pans-for containing molten lead, constructed of alloy capable of resisting heat appropriate to the purposes of normalizing metal goods such as. 6 wire, fiat s trips,-and the like, and which pans, in order to facilitate effective'submergence of the continuously movinggoods for the necessary duration of time, are'designed in the form of a long shallow trough, closed at 10 top to reduce atmospheric oxidation of themolten lead, and provided with so-called sinkers to hold the heat treated goods beneath the surface of the bath through which they travel. I I,

} The presentinvention provides a design of lead pan which, while'serv-ing' the purposes of the pans heretofore made, is more easily constructed; is lnore substantial and resistant-under stresses encountered in use; is more convenient to use, with respect to the introduction of the goods into the bath; will avoid the use of separately formed sinkers; and will afford greater protection of the lead bath from ingress of'atmospheric oxygen. Accordingly, the invention proceeds upon the principle of forming the pan proper or container portion of the utensil as a separate piece from the top closure or cover thereof, so that the latter can be laid on after the wires or strips are laid in through the open top of the trough; the cover being fitted under conditions which cause it soon to be come sealed as a result of the use of the utensil; the sinkers being integral with the cover. so that slots or other openings to admit the sinkers are avoided; and the inconvenience of separately handling and securing and releasing the sinkers is not involved. And the cover may be subdivided into a plurality of panel-like sections which prevents the development of stresses resulting in warping of the cover, which would render it unfit for use. Pyrometer openings are preferably made in the cover, for instance, at the meeting edges of the two cover sections, but these openings may be tamped to check the circulation of atmosphere over the bath. Also, the cover sections and walls of the trough may be designed with cooperating Hold-down means, such, for instance, as pertions taken, respectively, on lines 3w3w and;

1931. Serial No 532,824.

forated lugs on thewalls passing through perforated ears onthecover sections and receiving hold-down keys; but even special hold-down means may be dispensed with since the nature 3 ofthe cover adapts it to be made withsufficient mass 'to resist lifting force of the traversing wires'or strips, bythe 'mere weightof the cover. j In the accompanying drawing- 3 y Figures 1' to 4 show one construction of the new lead pan, Figure 1 being a planview Figure 2 being a vertical longitudinal section and Figures 3 and ibeing two transverse sec- Jew-lard Figural. 12$

Figures 5 to 7.show. another construction lof'the new lead pan; Figure 6 being a top plan view; Figure 7a vertical longitudinal section and'Figure 5 a transversesection on the .line 5w 5w of Figure 6. y The two constructions selected for purposes of illustration difi'ervma-inly int-he omis- I sion of special cover; holding means, in Figures 1 to 4, and the useof a hold-down means for the cover, in Figures 5 to 7. j

Referring to Figures 1 to 4, 1 represents the receptacle in the form of an elongated shallow trough having at its respective ends, lips 2, 3, constructed with channels 4', 5,

adapting them to support and guide'goods,

such as wires 6, drawn continuously through the bath of the pan as an incident to the 5 heat treatment of such goods. Trough 1 is closed at top by a cover indicated generally by the reference character 7, but preferablyzs v composed of a plurality of panel-like sections, for instance, end, sections 7a and one or more intermediate sections 7?), suitably fitted to r I sealing faces such as 8- on the side walls'of I the troughdn a manner tocause the pan, 9 over I the greater portion of its superficial area, to be closed against free ingress or egress of atmosphere, so that the greater por-- tion of the molten lead, which constitutes the bath through which the goods are being drawn, will be protected from free oxidation:

As a further barrier against free circulation of atmosphere over the main body of the bath; the cover 7 has sinkers 9 formed integral therewith and designed in the form of bafiies which dip into the surface of the bath. These sinkers 9 serve the further purpose of resist- These vents, with or without the inserted oxide will also take place to a materially helpful degree at the points 8 between the cover and the walls. represents pyrometer vents with which the cover 7 is preferably provided.

pyrometers, may be tamped while the utensil is in use in order to check convection of atmosphere through the space above the bath.

In Fi ures 1 to 4 the cover sections will rely on th ency of the goods to straighten out under the tension at which they are drawn through the bath, and this construction will be found satisfactory even with a relatively light cover in the case of small wire or thin strips. In

cases where heavier stock is to be heat treated,

it may be founddesirable to provide a special means for holding down the cover sections; and to this end, as shown in Figures 5 to 7, trough 1a is constructed with lugs 11 on its side walls and ears 12 having perforations 13 on its cover sections 7 am, 7 baa, so that afterv the cover sections, otherwise designed as described in connection with Figures 1 to 4,

eir own mass for holding them down against lifting force resulting from the tendtrough formed of a plurality of sections adapted to meet and provide a to closure for the trough; said cover sections ing individually provided with means for positioning them upon the trough, and also with means for holding submerged in the bath of the trough, goods traversing said bath.

2. A lead pan for the purposes described, comprising a trough, a cover composed of a plurality of separately removable cover sections, and sinkers for submer ing the goods beneath the surface of the bath; said sinkers being formed integrally upon and removable with the respective cover sections and entering between the walls of the trough and resisting lateral displacement of the cover sections thereon ;-and the cover sections, when positioned by their sinkers, bein constructed to abut at their ends and there y complete the closure of the trough.

3. A lead pan for heat treatment purposes, comprising separately formed trough and cover members constructed with intersecting key-receiving lugs and ears for holding the cover member down upon the trough member; said cover member carrying means for holding submerged in the bath of the trough member, goods traversing said bath.

4. A l'eadpan as described in claim 2, in which the trough and cover sections are likewise providedwith releasable interengaging means resisting relative movement between the cover sections and the trough vertically.

Signed at Chicago Heights, Illinois, this th day of April, 1931'.

FRANK AtFAHRENWALD.

are placed in position upon the trough, wedging or other forms of keys 14 may be inserted to hold the cover in place. Structural features disclosed in Figures 5 to 7 and not specifically enumerated, are indexed by the same reference characters and covered by the same description as corresponding parts'in, .Figures 1 to 4.

Theservice of old types of lead pan is usually terminated during a first run or heat by some localized failure in either its top 0 omre or pan portion, and such failure generally necessitated scrapping the entire casting. I In utensils having the new construction herein disclosed, both the pan member and the cover member may be used a number of times and if one of these members fails, it alone need be replaced instead of the entire utensil.

Moreover, with the cover member formed in sections waste resulting from discard in the event 0 failure-is still further reduced, inasmuch as but a single section of the cover will have to. be replaced. I i

I claim:

1. A lead pan for heat treatment purposes,

constructed with a trough for containing molten metal to be traversed by goods sub-' jected to heat treatment, and a cover for said 

